This evaluation summarizes the findings of an external evaluation of the African Institute for Mathematical Sciences South Africa (AIMS-SA). The evaluation assessed AIMS-SA's relevance, efficiency, effectiveness, impact, and sustainability based on interviews and surveys of alumni. Key findings include that AIMS-SA is building African capacity in mathematical sciences and addressing development challenges, and 89% of alumni reported it increased their awareness of math's role. However, concerns about long-term sustainability were raised given reliance on external support. The evaluation concludes AIMS-SA has been successful but should strengthen impact reporting and address sustainability challenges.